Body Mass Index (BMI)
Obesity is a very prevalent problem in the US that impacts on health and mortality and is associated with billions of dollars in health care costs. The BMI, a measure of weight adjusted for height, is used widely throughout the world to identify obese individuals as well as the relationship between body mass and mortality. Obese BMI is generally considered a risk factor for mortality and this has been documented in studies of the general population as well as NFL players.
Playing-time BMI based on weight and height while playing professional basketball and football is computed and tested as a risk factor. Nearly 90% of NFL players have either overweight (58.8%) or obese (30.8%) BMIs. Surprisingly, no NBA players are obese and only about 13% reach the overweight threshold.
Controlling for year of birth in survival analysis, overweight BMI is a significant predictor of mortality risk within NBA players. However, obese BMI is required to significantly elevate mortality risk within NFL players. Mortality risk is increased by 40% in overweight NBA players and by 52% in obese NFL players. There are also significant between-league differences in mortality risk when BMI and year of birth are controlled. NBA players have a 29% increased mortality risk compared to NFL players when the categorical version of BMI is included in survival analysis. Given the absence of overlap at the obese end of the BMI scale between players in the two leagues, these results require scrutiny.
KeywordsObesity and mortality Body mass index (BMI) BMI and increased mortality risk BMI and mortality in former NBA and NFL players Obese BMI in NFL players
- Adams, K. F., Schatzkin, A., Harris, T. B., Kinist, V., Meow, T., Ballard-Earbash, R., Hollenbeck, A., & Leitzmann, M. F. (2006). Overweight, obesity, and mortality in a large prospective cohort of persons 50 to 71 years old. The New England Journal of Medicine, 355, 763–778.CrossRefPubMedGoogle Scholar
- Baron, S., & Rinsky, R. (1994). Health hazard evaluation report, National Football League players mortality study. Report No. HETA 88–085. Atlanta: Centers for Disease Control and Prevention/National Institute for Occupational Safety and Health. Retrieved from http://www.cdc.gov/niosh/pdfs/nflfactsheet.pdf
- Bellisari, A. (2013). The obesity epidemic in North America. Illinois: Waveland Press.Google Scholar
- CDC, Centers for Disease Control and Prevention (2015). About adult BMI. Retrieved from https://www.cdc.gov/healthyweight/assessing/bmi/adult_bmi/
- Colditz, G. A., & Wang, C. (2008). Economic costs of obesity. In F. Hu (Ed.), Obesity epidemiology. New York: Oxford University Press.Google Scholar
- Finucane, M. M., Stevens, G. A., Cowan, M. J., Danaei, G., Lin, J. K., Paciorek, C. J., Singh, G. M., Gutierrez, H. R., Lu, Y., Bahalim, A. N., Farzadfar, F., Riley, L. M., & Ezzati, M. (2011). Global burden of metabolic risk factors of chronic diseases collaborating group (Body Mass Index). National, regional, and global trends in body-mass index since 1980: Systematic analysis of health examination surveys and epidemiological studies with 960 country-years and 9·1 million participants. Lancet, 377(9765), 557–567.CrossRefPubMedPubMedCentralGoogle Scholar
- WHO Expert Committee (1995). WHO physical status: The use and interpretation of anthropometry: Report of a World Health Organization (WHO) Expert Committee. Geneva. Retrieved from http://www.who.int/childgrowth/publications/physical_status/en/
- WHO Fact Sheet (2016). Obesity and overweight. Retrieved from http://www.who.int/mediacentre/factsheets/fs311/en/
- WHO Media Center (2013). Obesity and overweight. Geneva. Retrieved from http://www.who.int/mediacentre/factsheets/fs311/en/